From 51c0ddc7583494ac6ecd1f5d1688f1aced7ea2f9 Mon Sep 17 00:00:00 2001 From: Kiran Gunda Date: Fri, 1 Nov 2019 11:56:57 +0530 Subject: backlight: qcom-wled: Rename pm8941-wled.c to qcom-wled.c pm8941-wled.c driver is supporting the WLED peripheral on pm8941. Rename it to qcom-wled.c so that it can support WLED on multiple PMICs. Signed-off-by: Kiran Gunda Reviewed-by: Bjorn Andersson Acked-by: Rob Herring Acked-by: Daniel Thompson Acked-by: Pavel Machek Signed-off-by: Lee Jones --- drivers/video/backlight/Kconfig | 8 +- drivers/video/backlight/Makefile | 2 +- drivers/video/backlight/pm8941-wled.c | 424 ---------------------------------- drivers/video/backlight/qcom-wled.c | 424 ++++++++++++++++++++++++++++++++++ 4 files changed, 429 insertions(+), 429 deletions(-) delete mode 100644 drivers/video/backlight/pm8941-wled.c create mode 100644 drivers/video/backlight/qcom-wled.c (limited to 'drivers/video') diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index d09396393724..403707a3e503 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -282,12 +282,12 @@ config BACKLIGHT_TOSA If you have an Sharp SL-6000 Zaurus say Y to enable a driver for its backlight -config BACKLIGHT_PM8941_WLED - tristate "Qualcomm PM8941 WLED Driver" +config BACKLIGHT_QCOM_WLED + tristate "Qualcomm PMIC WLED Driver" select REGMAP help - If you have the Qualcomm PM8941, say Y to enable a driver for the - WLED block. + If you have the Qualcomm PMIC, say Y to enable a driver for the + WLED block. Currently it supports PM8941 and PMI8998. config BACKLIGHT_SAHARA tristate "Tabletkiosk Sahara Touch-iT Backlight Driver" diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index 63c507c07437..6f8777037c37 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -48,8 +48,8 @@ obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o obj-$(CONFIG_BACKLIGHT_OT200) += ot200_bl.o obj-$(CONFIG_BACKLIGHT_PANDORA) += pandora_bl.o obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o -obj-$(CONFIG_BACKLIGHT_PM8941_WLED) += pm8941-wled.o obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o +obj-$(CONFIG_BACKLIGHT_QCOM_WLED) += qcom-wled.o obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o obj-$(CONFIG_BACKLIGHT_SKY81452) += sky81452-backlight.o obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o diff --git a/drivers/video/backlight/pm8941-wled.c b/drivers/video/backlight/pm8941-wled.c deleted file mode 100644 index 82b85725a22a..000000000000 --- a/drivers/video/backlight/pm8941-wled.c +++ /dev/null @@ -1,424 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* Copyright (c) 2015, Sony Mobile Communications, AB. - */ - -#include -#include -#include -#include -#include -#include - -/* From DT binding */ -#define PM8941_WLED_DEFAULT_BRIGHTNESS 2048 - -#define PM8941_WLED_REG_VAL_BASE 0x40 -#define PM8941_WLED_REG_VAL_MAX 0xFFF - -#define PM8941_WLED_REG_MOD_EN 0x46 -#define PM8941_WLED_REG_MOD_EN_BIT BIT(7) -#define PM8941_WLED_REG_MOD_EN_MASK BIT(7) - -#define PM8941_WLED_REG_SYNC 0x47 -#define PM8941_WLED_REG_SYNC_MASK 0x07 -#define PM8941_WLED_REG_SYNC_LED1 BIT(0) -#define PM8941_WLED_REG_SYNC_LED2 BIT(1) -#define PM8941_WLED_REG_SYNC_LED3 BIT(2) -#define PM8941_WLED_REG_SYNC_ALL 0x07 -#define PM8941_WLED_REG_SYNC_CLEAR 0x00 - -#define PM8941_WLED_REG_FREQ 0x4c -#define PM8941_WLED_REG_FREQ_MASK 0x0f - -#define PM8941_WLED_REG_OVP 0x4d -#define PM8941_WLED_REG_OVP_MASK 0x03 - -#define PM8941_WLED_REG_BOOST 0x4e -#define PM8941_WLED_REG_BOOST_MASK 0x07 - -#define PM8941_WLED_REG_SINK 0x4f -#define PM8941_WLED_REG_SINK_MASK 0xe0 -#define PM8941_WLED_REG_SINK_SHFT 0x05 - -/* Per-'string' registers below */ -#define PM8941_WLED_REG_STR_OFFSET 0x10 - -#define PM8941_WLED_REG_STR_MOD_EN_BASE 0x60 -#define PM8941_WLED_REG_STR_MOD_MASK BIT(7) -#define PM8941_WLED_REG_STR_MOD_EN BIT(7) - -#define PM8941_WLED_REG_STR_SCALE_BASE 0x62 -#define PM8941_WLED_REG_STR_SCALE_MASK 0x1f - -#define PM8941_WLED_REG_STR_MOD_SRC_BASE 0x63 -#define PM8941_WLED_REG_STR_MOD_SRC_MASK 0x01 -#define PM8941_WLED_REG_STR_MOD_SRC_INT 0x00 -#define PM8941_WLED_REG_STR_MOD_SRC_EXT 0x01 - -#define PM8941_WLED_REG_STR_CABC_BASE 0x66 -#define PM8941_WLED_REG_STR_CABC_MASK BIT(7) -#define PM8941_WLED_REG_STR_CABC_EN BIT(7) - -struct pm8941_wled_config { - u32 i_boost_limit; - u32 ovp; - u32 switch_freq; - u32 num_strings; - u32 i_limit; - bool cs_out_en; - bool ext_gen; - bool cabc_en; -}; - -struct pm8941_wled { - const char *name; - struct regmap *regmap; - u16 addr; - - struct pm8941_wled_config cfg; -}; - -static int pm8941_wled_update_status(struct backlight_device *bl) -{ - struct pm8941_wled *wled = bl_get_data(bl); - u16 val = bl->props.brightness; - u8 ctrl = 0; - int rc; - int i; - - if (bl->props.power != FB_BLANK_UNBLANK || - bl->props.fb_blank != FB_BLANK_UNBLANK || - bl->props.state & BL_CORE_FBBLANK) - val = 0; - - if (val != 0) - ctrl = PM8941_WLED_REG_MOD_EN_BIT; - - rc = regmap_update_bits(wled->regmap, - wled->addr + PM8941_WLED_REG_MOD_EN, - PM8941_WLED_REG_MOD_EN_MASK, ctrl); - if (rc) - return rc; - - for (i = 0; i < wled->cfg.num_strings; ++i) { - u8 v[2] = { val & 0xff, (val >> 8) & 0xf }; - - rc = regmap_bulk_write(wled->regmap, - wled->addr + PM8941_WLED_REG_VAL_BASE + 2 * i, - v, 2); - if (rc) - return rc; - } - - rc = regmap_update_bits(wled->regmap, - wled->addr + PM8941_WLED_REG_SYNC, - PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_ALL); - if (rc) - return rc; - - rc = regmap_update_bits(wled->regmap, - wled->addr + PM8941_WLED_REG_SYNC, - PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_CLEAR); - return rc; -} - -static int pm8941_wled_setup(struct pm8941_wled *wled) -{ - int rc; - int i; - - rc = regmap_update_bits(wled->regmap, - wled->addr + PM8941_WLED_REG_OVP, - PM8941_WLED_REG_OVP_MASK, wled->cfg.ovp); - if (rc) - return rc; - - rc = regmap_update_bits(wled->regmap, - wled->addr + PM8941_WLED_REG_BOOST, - PM8941_WLED_REG_BOOST_MASK, wled->cfg.i_boost_limit); - if (rc) - return rc; - - rc = regmap_update_bits(wled->regmap, - wled->addr + PM8941_WLED_REG_FREQ, - PM8941_WLED_REG_FREQ_MASK, wled->cfg.switch_freq); - if (rc) - return rc; - - if (wled->cfg.cs_out_en) { - u8 all = (BIT(wled->cfg.num_strings) - 1) - << PM8941_WLED_REG_SINK_SHFT; - - rc = regmap_update_bits(wled->regmap, - wled->addr + PM8941_WLED_REG_SINK, - PM8941_WLED_REG_SINK_MASK, all); - if (rc) - return rc; - } - - for (i = 0; i < wled->cfg.num_strings; ++i) { - u16 addr = wled->addr + PM8941_WLED_REG_STR_OFFSET * i; - - rc = regmap_update_bits(wled->regmap, - addr + PM8941_WLED_REG_STR_MOD_EN_BASE, - PM8941_WLED_REG_STR_MOD_MASK, - PM8941_WLED_REG_STR_MOD_EN); - if (rc) - return rc; - - if (wled->cfg.ext_gen) { - rc = regmap_update_bits(wled->regmap, - addr + PM8941_WLED_REG_STR_MOD_SRC_BASE, - PM8941_WLED_REG_STR_MOD_SRC_MASK, - PM8941_WLED_REG_STR_MOD_SRC_EXT); - if (rc) - return rc; - } - - rc = regmap_update_bits(wled->regmap, - addr + PM8941_WLED_REG_STR_SCALE_BASE, - PM8941_WLED_REG_STR_SCALE_MASK, - wled->cfg.i_limit); - if (rc) - return rc; - - rc = regmap_update_bits(wled->regmap, - addr + PM8941_WLED_REG_STR_CABC_BASE, - PM8941_WLED_REG_STR_CABC_MASK, - wled->cfg.cabc_en ? - PM8941_WLED_REG_STR_CABC_EN : 0); - if (rc) - return rc; - } - - return 0; -} - -static const struct pm8941_wled_config pm8941_wled_config_defaults = { - .i_boost_limit = 3, - .i_limit = 20, - .ovp = 2, - .switch_freq = 5, - .num_strings = 0, - .cs_out_en = false, - .ext_gen = false, - .cabc_en = false, -}; - -struct pm8941_wled_var_cfg { - const u32 *values; - u32 (*fn)(u32); - int size; -}; - -static const u32 pm8941_wled_i_boost_limit_values[] = { - 105, 385, 525, 805, 980, 1260, 1400, 1680, -}; - -static const struct pm8941_wled_var_cfg pm8941_wled_i_boost_limit_cfg = { - .values = pm8941_wled_i_boost_limit_values, - .size = ARRAY_SIZE(pm8941_wled_i_boost_limit_values), -}; - -static const u32 pm8941_wled_ovp_values[] = { - 35, 32, 29, 27, -}; - -static const struct pm8941_wled_var_cfg pm8941_wled_ovp_cfg = { - .values = pm8941_wled_ovp_values, - .size = ARRAY_SIZE(pm8941_wled_ovp_values), -}; - -static u32 pm8941_wled_num_strings_values_fn(u32 idx) -{ - return idx + 1; -} - -static const struct pm8941_wled_var_cfg pm8941_wled_num_strings_cfg = { - .fn = pm8941_wled_num_strings_values_fn, - .size = 3, -}; - -static u32 pm8941_wled_switch_freq_values_fn(u32 idx) -{ - return 19200 / (2 * (1 + idx)); -} - -static const struct pm8941_wled_var_cfg pm8941_wled_switch_freq_cfg = { - .fn = pm8941_wled_switch_freq_values_fn, - .size = 16, -}; - -static const struct pm8941_wled_var_cfg pm8941_wled_i_limit_cfg = { - .size = 26, -}; - -static u32 pm8941_wled_values(const struct pm8941_wled_var_cfg *cfg, u32 idx) -{ - if (idx >= cfg->size) - return UINT_MAX; - if (cfg->fn) - return cfg->fn(idx); - if (cfg->values) - return cfg->values[idx]; - return idx; -} - -static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev) -{ - struct pm8941_wled_config *cfg = &wled->cfg; - u32 val; - int rc; - u32 c; - int i; - int j; - - const struct { - const char *name; - u32 *val_ptr; - const struct pm8941_wled_var_cfg *cfg; - } u32_opts[] = { - { - "qcom,current-boost-limit", - &cfg->i_boost_limit, - .cfg = &pm8941_wled_i_boost_limit_cfg, - }, - { - "qcom,current-limit", - &cfg->i_limit, - .cfg = &pm8941_wled_i_limit_cfg, - }, - { - "qcom,ovp", - &cfg->ovp, - .cfg = &pm8941_wled_ovp_cfg, - }, - { - "qcom,switching-freq", - &cfg->switch_freq, - .cfg = &pm8941_wled_switch_freq_cfg, - }, - { - "qcom,num-strings", - &cfg->num_strings, - .cfg = &pm8941_wled_num_strings_cfg, - }, - }; - const struct { - const char *name; - bool *val_ptr; - } bool_opts[] = { - { "qcom,cs-out", &cfg->cs_out_en, }, - { "qcom,ext-gen", &cfg->ext_gen, }, - { "qcom,cabc", &cfg->cabc_en, }, - }; - - rc = of_property_read_u32(dev->of_node, "reg", &val); - if (rc || val > 0xffff) { - dev_err(dev, "invalid IO resources\n"); - return rc ? rc : -EINVAL; - } - wled->addr = val; - - rc = of_property_read_string(dev->of_node, "label", &wled->name); - if (rc) - wled->name = devm_kasprintf(dev, GFP_KERNEL, "%pOFn", dev->of_node); - - *cfg = pm8941_wled_config_defaults; - for (i = 0; i < ARRAY_SIZE(u32_opts); ++i) { - rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val); - if (rc == -EINVAL) { - continue; - } else if (rc) { - dev_err(dev, "error reading '%s'\n", u32_opts[i].name); - return rc; - } - - c = UINT_MAX; - for (j = 0; c != val; j++) { - c = pm8941_wled_values(u32_opts[i].cfg, j); - if (c == UINT_MAX) { - dev_err(dev, "invalid value for '%s'\n", - u32_opts[i].name); - return -EINVAL; - } - } - - dev_dbg(dev, "'%s' = %u\n", u32_opts[i].name, c); - *u32_opts[i].val_ptr = j; - } - - for (i = 0; i < ARRAY_SIZE(bool_opts); ++i) { - if (of_property_read_bool(dev->of_node, bool_opts[i].name)) - *bool_opts[i].val_ptr = true; - } - - cfg->num_strings = cfg->num_strings + 1; - - return 0; -} - -static const struct backlight_ops pm8941_wled_ops = { - .update_status = pm8941_wled_update_status, -}; - -static int pm8941_wled_probe(struct platform_device *pdev) -{ - struct backlight_properties props; - struct backlight_device *bl; - struct pm8941_wled *wled; - struct regmap *regmap; - u32 val; - int rc; - - regmap = dev_get_regmap(pdev->dev.parent, NULL); - if (!regmap) { - dev_err(&pdev->dev, "Unable to get regmap\n"); - return -EINVAL; - } - - wled = devm_kzalloc(&pdev->dev, sizeof(*wled), GFP_KERNEL); - if (!wled) - return -ENOMEM; - - wled->regmap = regmap; - - rc = pm8941_wled_configure(wled, &pdev->dev); - if (rc) - return rc; - - rc = pm8941_wled_setup(wled); - if (rc) - return rc; - - val = PM8941_WLED_DEFAULT_BRIGHTNESS; - of_property_read_u32(pdev->dev.of_node, "default-brightness", &val); - - memset(&props, 0, sizeof(struct backlight_properties)); - props.type = BACKLIGHT_RAW; - props.brightness = val; - props.max_brightness = PM8941_WLED_REG_VAL_MAX; - bl = devm_backlight_device_register(&pdev->dev, wled->name, - &pdev->dev, wled, - &pm8941_wled_ops, &props); - return PTR_ERR_OR_ZERO(bl); -}; - -static const struct of_device_id pm8941_wled_match_table[] = { - { .compatible = "qcom,pm8941-wled" }, - {} -}; -MODULE_DEVICE_TABLE(of, pm8941_wled_match_table); - -static struct platform_driver pm8941_wled_driver = { - .probe = pm8941_wled_probe, - .driver = { - .name = "pm8941-wled", - .of_match_table = pm8941_wled_match_table, - }, -}; - -module_platform_driver(pm8941_wled_driver); - -MODULE_DESCRIPTION("pm8941 wled driver"); -MODULE_LICENSE("GPL v2"); diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c new file mode 100644 index 000000000000..82b85725a22a --- /dev/null +++ b/drivers/video/backlight/qcom-wled.c @@ -0,0 +1,424 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2015, Sony Mobile Communications, AB. + */ + +#include +#include +#include +#include +#include +#include + +/* From DT binding */ +#define PM8941_WLED_DEFAULT_BRIGHTNESS 2048 + +#define PM8941_WLED_REG_VAL_BASE 0x40 +#define PM8941_WLED_REG_VAL_MAX 0xFFF + +#define PM8941_WLED_REG_MOD_EN 0x46 +#define PM8941_WLED_REG_MOD_EN_BIT BIT(7) +#define PM8941_WLED_REG_MOD_EN_MASK BIT(7) + +#define PM8941_WLED_REG_SYNC 0x47 +#define PM8941_WLED_REG_SYNC_MASK 0x07 +#define PM8941_WLED_REG_SYNC_LED1 BIT(0) +#define PM8941_WLED_REG_SYNC_LED2 BIT(1) +#define PM8941_WLED_REG_SYNC_LED3 BIT(2) +#define PM8941_WLED_REG_SYNC_ALL 0x07 +#define PM8941_WLED_REG_SYNC_CLEAR 0x00 + +#define PM8941_WLED_REG_FREQ 0x4c +#define PM8941_WLED_REG_FREQ_MASK 0x0f + +#define PM8941_WLED_REG_OVP 0x4d +#define PM8941_WLED_REG_OVP_MASK 0x03 + +#define PM8941_WLED_REG_BOOST 0x4e +#define PM8941_WLED_REG_BOOST_MASK 0x07 + +#define PM8941_WLED_REG_SINK 0x4f +#define PM8941_WLED_REG_SINK_MASK 0xe0 +#define PM8941_WLED_REG_SINK_SHFT 0x05 + +/* Per-'string' registers below */ +#define PM8941_WLED_REG_STR_OFFSET 0x10 + +#define PM8941_WLED_REG_STR_MOD_EN_BASE 0x60 +#define PM8941_WLED_REG_STR_MOD_MASK BIT(7) +#define PM8941_WLED_REG_STR_MOD_EN BIT(7) + +#define PM8941_WLED_REG_STR_SCALE_BASE 0x62 +#define PM8941_WLED_REG_STR_SCALE_MASK 0x1f + +#define PM8941_WLED_REG_STR_MOD_SRC_BASE 0x63 +#define PM8941_WLED_REG_STR_MOD_SRC_MASK 0x01 +#define PM8941_WLED_REG_STR_MOD_SRC_INT 0x00 +#define PM8941_WLED_REG_STR_MOD_SRC_EXT 0x01 + +#define PM8941_WLED_REG_STR_CABC_BASE 0x66 +#define PM8941_WLED_REG_STR_CABC_MASK BIT(7) +#define PM8941_WLED_REG_STR_CABC_EN BIT(7) + +struct pm8941_wled_config { + u32 i_boost_limit; + u32 ovp; + u32 switch_freq; + u32 num_strings; + u32 i_limit; + bool cs_out_en; + bool ext_gen; + bool cabc_en; +}; + +struct pm8941_wled { + const char *name; + struct regmap *regmap; + u16 addr; + + struct pm8941_wled_config cfg; +}; + +static int pm8941_wled_update_status(struct backlight_device *bl) +{ + struct pm8941_wled *wled = bl_get_data(bl); + u16 val = bl->props.brightness; + u8 ctrl = 0; + int rc; + int i; + + if (bl->props.power != FB_BLANK_UNBLANK || + bl->props.fb_blank != FB_BLANK_UNBLANK || + bl->props.state & BL_CORE_FBBLANK) + val = 0; + + if (val != 0) + ctrl = PM8941_WLED_REG_MOD_EN_BIT; + + rc = regmap_update_bits(wled->regmap, + wled->addr + PM8941_WLED_REG_MOD_EN, + PM8941_WLED_REG_MOD_EN_MASK, ctrl); + if (rc) + return rc; + + for (i = 0; i < wled->cfg.num_strings; ++i) { + u8 v[2] = { val & 0xff, (val >> 8) & 0xf }; + + rc = regmap_bulk_write(wled->regmap, + wled->addr + PM8941_WLED_REG_VAL_BASE + 2 * i, + v, 2); + if (rc) + return rc; + } + + rc = regmap_update_bits(wled->regmap, + wled->addr + PM8941_WLED_REG_SYNC, + PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_ALL); + if (rc) + return rc; + + rc = regmap_update_bits(wled->regmap, + wled->addr + PM8941_WLED_REG_SYNC, + PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_CLEAR); + return rc; +} + +static int pm8941_wled_setup(struct pm8941_wled *wled) +{ + int rc; + int i; + + rc = regmap_update_bits(wled->regmap, + wled->addr + PM8941_WLED_REG_OVP, + PM8941_WLED_REG_OVP_MASK, wled->cfg.ovp); + if (rc) + return rc; + + rc = regmap_update_bits(wled->regmap, + wled->addr + PM8941_WLED_REG_BOOST, + PM8941_WLED_REG_BOOST_MASK, wled->cfg.i_boost_limit); + if (rc) + return rc; + + rc = regmap_update_bits(wled->regmap, + wled->addr + PM8941_WLED_REG_FREQ, + PM8941_WLED_REG_FREQ_MASK, wled->cfg.switch_freq); + if (rc) + return rc; + + if (wled->cfg.cs_out_en) { + u8 all = (BIT(wled->cfg.num_strings) - 1) + << PM8941_WLED_REG_SINK_SHFT; + + rc = regmap_update_bits(wled->regmap, + wled->addr + PM8941_WLED_REG_SINK, + PM8941_WLED_REG_SINK_MASK, all); + if (rc) + return rc; + } + + for (i = 0; i < wled->cfg.num_strings; ++i) { + u16 addr = wled->addr + PM8941_WLED_REG_STR_OFFSET * i; + + rc = regmap_update_bits(wled->regmap, + addr + PM8941_WLED_REG_STR_MOD_EN_BASE, + PM8941_WLED_REG_STR_MOD_MASK, + PM8941_WLED_REG_STR_MOD_EN); + if (rc) + return rc; + + if (wled->cfg.ext_gen) { + rc = regmap_update_bits(wled->regmap, + addr + PM8941_WLED_REG_STR_MOD_SRC_BASE, + PM8941_WLED_REG_STR_MOD_SRC_MASK, + PM8941_WLED_REG_STR_MOD_SRC_EXT); + if (rc) + return rc; + } + + rc = regmap_update_bits(wled->regmap, + addr + PM8941_WLED_REG_STR_SCALE_BASE, + PM8941_WLED_REG_STR_SCALE_MASK, + wled->cfg.i_limit); + if (rc) + return rc; + + rc = regmap_update_bits(wled->regmap, + addr + PM8941_WLED_REG_STR_CABC_BASE, + PM8941_WLED_REG_STR_CABC_MASK, + wled->cfg.cabc_en ? + PM8941_WLED_REG_STR_CABC_EN : 0); + if (rc) + return rc; + } + + return 0; +} + +static const struct pm8941_wled_config pm8941_wled_config_defaults = { + .i_boost_limit = 3, + .i_limit = 20, + .ovp = 2, + .switch_freq = 5, + .num_strings = 0, + .cs_out_en = false, + .ext_gen = false, + .cabc_en = false, +}; + +struct pm8941_wled_var_cfg { + const u32 *values; + u32 (*fn)(u32); + int size; +}; + +static const u32 pm8941_wled_i_boost_limit_values[] = { + 105, 385, 525, 805, 980, 1260, 1400, 1680, +}; + +static const struct pm8941_wled_var_cfg pm8941_wled_i_boost_limit_cfg = { + .values = pm8941_wled_i_boost_limit_values, + .size = ARRAY_SIZE(pm8941_wled_i_boost_limit_values), +}; + +static const u32 pm8941_wled_ovp_values[] = { + 35, 32, 29, 27, +}; + +static const struct pm8941_wled_var_cfg pm8941_wled_ovp_cfg = { + .values = pm8941_wled_ovp_values, + .size = ARRAY_SIZE(pm8941_wled_ovp_values), +}; + +static u32 pm8941_wled_num_strings_values_fn(u32 idx) +{ + return idx + 1; +} + +static const struct pm8941_wled_var_cfg pm8941_wled_num_strings_cfg = { + .fn = pm8941_wled_num_strings_values_fn, + .size = 3, +}; + +static u32 pm8941_wled_switch_freq_values_fn(u32 idx) +{ + return 19200 / (2 * (1 + idx)); +} + +static const struct pm8941_wled_var_cfg pm8941_wled_switch_freq_cfg = { + .fn = pm8941_wled_switch_freq_values_fn, + .size = 16, +}; + +static const struct pm8941_wled_var_cfg pm8941_wled_i_limit_cfg = { + .size = 26, +}; + +static u32 pm8941_wled_values(const struct pm8941_wled_var_cfg *cfg, u32 idx) +{ + if (idx >= cfg->size) + return UINT_MAX; + if (cfg->fn) + return cfg->fn(idx); + if (cfg->values) + return cfg->values[idx]; + return idx; +} + +static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev) +{ + struct pm8941_wled_config *cfg = &wled->cfg; + u32 val; + int rc; + u32 c; + int i; + int j; + + const struct { + const char *name; + u32 *val_ptr; + const struct pm8941_wled_var_cfg *cfg; + } u32_opts[] = { + { + "qcom,current-boost-limit", + &cfg->i_boost_limit, + .cfg = &pm8941_wled_i_boost_limit_cfg, + }, + { + "qcom,current-limit", + &cfg->i_limit, + .cfg = &pm8941_wled_i_limit_cfg, + }, + { + "qcom,ovp", + &cfg->ovp, + .cfg = &pm8941_wled_ovp_cfg, + }, + { + "qcom,switching-freq", + &cfg->switch_freq, + .cfg = &pm8941_wled_switch_freq_cfg, + }, + { + "qcom,num-strings", + &cfg->num_strings, + .cfg = &pm8941_wled_num_strings_cfg, + }, + }; + const struct { + const char *name; + bool *val_ptr; + } bool_opts[] = { + { "qcom,cs-out", &cfg->cs_out_en, }, + { "qcom,ext-gen", &cfg->ext_gen, }, + { "qcom,cabc", &cfg->cabc_en, }, + }; + + rc = of_property_read_u32(dev->of_node, "reg", &val); + if (rc || val > 0xffff) { + dev_err(dev, "invalid IO resources\n"); + return rc ? rc : -EINVAL; + } + wled->addr = val; + + rc = of_property_read_string(dev->of_node, "label", &wled->name); + if (rc) + wled->name = devm_kasprintf(dev, GFP_KERNEL, "%pOFn", dev->of_node); + + *cfg = pm8941_wled_config_defaults; + for (i = 0; i < ARRAY_SIZE(u32_opts); ++i) { + rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val); + if (rc == -EINVAL) { + continue; + } else if (rc) { + dev_err(dev, "error reading '%s'\n", u32_opts[i].name); + return rc; + } + + c = UINT_MAX; + for (j = 0; c != val; j++) { + c = pm8941_wled_values(u32_opts[i].cfg, j); + if (c == UINT_MAX) { + dev_err(dev, "invalid value for '%s'\n", + u32_opts[i].name); + return -EINVAL; + } + } + + dev_dbg(dev, "'%s' = %u\n", u32_opts[i].name, c); + *u32_opts[i].val_ptr = j; + } + + for (i = 0; i < ARRAY_SIZE(bool_opts); ++i) { + if (of_property_read_bool(dev->of_node, bool_opts[i].name)) + *bool_opts[i].val_ptr = true; + } + + cfg->num_strings = cfg->num_strings + 1; + + return 0; +} + +static const struct backlight_ops pm8941_wled_ops = { + .update_status = pm8941_wled_update_status, +}; + +static int pm8941_wled_probe(struct platform_device *pdev) +{ + struct backlight_properties props; + struct backlight_device *bl; + struct pm8941_wled *wled; + struct regmap *regmap; + u32 val; + int rc; + + regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!regmap) { + dev_err(&pdev->dev, "Unable to get regmap\n"); + return -EINVAL; + } + + wled = devm_kzalloc(&pdev->dev, sizeof(*wled), GFP_KERNEL); + if (!wled) + return -ENOMEM; + + wled->regmap = regmap; + + rc = pm8941_wled_configure(wled, &pdev->dev); + if (rc) + return rc; + + rc = pm8941_wled_setup(wled); + if (rc) + return rc; + + val = PM8941_WLED_DEFAULT_BRIGHTNESS; + of_property_read_u32(pdev->dev.of_node, "default-brightness", &val); + + memset(&props, 0, sizeof(struct backlight_properties)); + props.type = BACKLIGHT_RAW; + props.brightness = val; + props.max_brightness = PM8941_WLED_REG_VAL_MAX; + bl = devm_backlight_device_register(&pdev->dev, wled->name, + &pdev->dev, wled, + &pm8941_wled_ops, &props); + return PTR_ERR_OR_ZERO(bl); +}; + +static const struct of_device_id pm8941_wled_match_table[] = { + { .compatible = "qcom,pm8941-wled" }, + {} +}; +MODULE_DEVICE_TABLE(of, pm8941_wled_match_table); + +static struct platform_driver pm8941_wled_driver = { + .probe = pm8941_wled_probe, + .driver = { + .name = "pm8941-wled", + .of_match_table = pm8941_wled_match_table, + }, +}; + +module_platform_driver(pm8941_wled_driver); + +MODULE_DESCRIPTION("pm8941 wled driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3-59-g8ed1b